7 most common problems with CRT TV and their possible diagnosis

Common problems with CRT TV

CRT (cathode-ray tube) television sets have gone down in popularity with the introduction of large screen, slim and flat LEDs and LCDs. However, there are many consumers who still have their CRT sets and are satisfied with them. But many problems often relate to the picture quality, picture color and clarity and sound quality of these CRTs. Sometimes the cost of repairing such problems in the CRT TV exceeds the cost of replacing it with a new TV.

 Here are some common CRT TV problems and their diagnosis:

CRT television has no image

CRT TV Picture problem

No image is a very common problem with cathode ray tube TVs. If you are facing such issue then check the obvious things first i.e. verify whether your TV is plugged in correctly and is receiving sufficient power for operation. If the power is OK, then check the video settings (like brightness, sharpness, contrast and picture settings). If the settings are fine then there can be problem in the video cable and hardware. If the basic diagnosis comes out fine then it might be the time to call a professional TV repair person. (Picture Source: www.overclockers.com)

Bowed picture or images not lined up

CRT TV repair

This is a very common picture problem with CRT TVs. It is usually caused by the  failure of an internal circuit called the convergence circuit. The circuit has convergence ICs, which when go bad create the problem of bowed picture.  Sometimes bad or faulty  soldered-in fuses and resistors can also cause image distortion. A technician or a PRO can easily repair this sort of problem in-home. (Picture Source: www.justanswer.com)

CRT displays one horizontal line in the center when turned-on

CRT TV display problem

Many time it happens that there appears a single thin horizontal line on the CRT TV screen. The probable cause of this problem can be a faulty yoke with a defective or burned coil inside it. The other probable cause can be loose contact between the yoke and the main board. The third possible cause can be a defective capacitor. (Picture Source: www.static.myce.com)

Single vertical line in the center of screen

Picture problem in CRT TV

Some time when you power on your CTR TV you see a single thin vertical line on the screen. The probable cause of this problem can be a faulty yoke with a defective or burned coil inside it. Other reason can be defective vertical ICs. The ICs may have lost contacts with solder joints because of the heat production during operation. (Picture Source: www.jestineyong.com)

CRT TV crackles when powered up or emits a strong electrical odor

CRT monitor repair

This is not a very common problem. The most prominent reason is cathode ray tube failure. The minor crackling noise is due to high voltage arcing. The possible reason behind the burning smell is caused by insulation burn. In such situation, immediately unplug the TV from the power outlet. Call a professional TV repair person and get it corrected.

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Colorful shadows on the sides

Shadow problem in CRT TV

Whether you have a CRT TV or owned it before, you must have witnessed at some point of time, a colorful shadow on the sides of the screen (can be seen as reddish orange shadow in the picture). It is mainly due to presence of any magnetic device near the TV. Magnets placed near a CRT can damage the set’s “shadow mask,” which can cause the wrong colors to appear in that area. (Picture Source: humphreykimathi.blogspot.com)

Cathode Ray tube

Shadow mask is located behind the glass screen, as shown in the above graphical Cathode Ray Tube picture. High-power magnets can sometime cause permanent damage to the CRT. (Picture Source: www.wiztech.wikispaces.com)

Bad sound or no sound from the TV

No sound or less sound is a commonly heard problem with CRT TVs. The most possible reason is faulty speakers. Other reasons can be damaged audio amplifier, a low supply voltage to the amplifier or a faulty audio IC. There can be other reasons as well like some faulty internal wiring.

Other frequent problems with CRT TV are loss of vertical sync and loss of horizontal sync in the picture. (Picture source: www.ronelex.com)

CRT TV sound Problem

Problems with CRT TV remote

If you’re facing problems with TV not responding to remote inputs, first replace the batteries! If the TV still isn’t responding, there’s a problem with the remote. In this case, it is better to replace the remote instead of repairing it. Below are some CRT TV compatible remotes that we recommend.

 

If your CRT TV is troubling you with the picture problems, sound problem or any other issue, connect with Mr. Right.

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For more information on consumer electronics functionality and care  visit Ideas by Mr. Right

 (Cover Picture source: www.blogs.which.co.uk)

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89 Comments

  1. 1

    Thank you for assistance in understanding TV. I’ve a Sonny TV 14″, which is showing two bright lines; one vertical and the other horizontal. Also a shadow covers the crossing lines. It’s not able to display picture

  2. 2

    I have the problem in my TV some times lining came on my TV screen. I don,t Know why it ,s happen . I think there is some screening problem . Please advise me on how to deal with this situation. You can provide me with your experienced technicians for thie work

  3. 3

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  5. 5

    very useful and informative content regarding CRT TV Repair and its possible diagnosis as most of the CRT are replaced by Smart TV having enormous features

  6. 6

    After a power outage, a Polestar CRT TV is only showing part of the picture horizontally.
    This has apparently got worse (less picture) over the past two weeks.
    The visible part is normal proportion and color, no banding or rolling, full width, and is centered on screen (about 20-25%).
    As if center of picture is seen through a black letterbox mask.
    No external V/H adjustments at back.
    Could this be a blown cap or vertical deflection IC?
    Neighbor’s TV.

  7. 7

    Hi I have an old Zenith TV
    Suddenly it stopped working, I have a black screen, no cahnnels
    nothing.
    I changed the Comcast with a new box, Have a new remote control,
    but nothing…
    Thank you

  8. 8

    I have an LG CRT TV, It is perfect and it has a perfect picture quality. Its sound is perfect but some times we see some fluctuation in sound. It becomes high and some times it becomes too low to hear. Please provide us with some solution. If possible you can arrange a doorstep visit by your technician.

    • 9

      Hi, b4 attending to the problem(s) of yr TV , I would love to now somethings here below:-
      1. – Check yr TV for proper audio settings e.g when the TV with stereo audio output speakers is set to right or left channel only, and the source audio is only on one channel and the opposite, u r likely to encounter audio challenges on yr TV audio output.
      2. – Dry joints on the audio path can cause audio fluctuations. Meaning this goes with the Temperature of the components in an equipment and/or how long has the equipment been ON, the longer the equipment being ON the warmer/hot the components get and hence affecting severely the dry joints which results in opening the circuit paths. when the equipment is turned ON dry joints may reset.
      3. – Unstable audio Transmission from the broadcasting source can cause audio fluctuation, how to verify this problem is by tuning or comparing with other TV channels.
      4. – Speaker(s) about to wear out.
      5. – And many more…

      • 10

        Please reader remove the first part of my posting and start from one, I mistakenly left it. That is were I say Hi b4 attending…..
        START FROM POINT NO 1 – 4 THATS YR SUGGESTED SOLUTIONS, I THAN YOU

  9. 11

    Hello,
    The right side of my CRT TV’s [JVC model no. AV-27230] screen is brighter than the left side, of the screen. How can I fix this? Thank you kindly

  10. 12

    Hi.
    Iv’e got a 21 inch Sony Trinitron from 1999. I’m nearly certain its not a faulty tube because the picture is pretty good for a tv its age, but the problem is i could have the tv on for maybe 6 hours and all of a sudden the screen goes black and but the sound stays on. I turn it off and on again maybe 3 or 4 times and the picture comes back again same as before and it may do the same thing again after so many hours. What would the problem be.?

  11. 13

    Hi.
    Iv’e got a 21 inch Sony Trinitron from 1999. I’m nearly certain its not a faulty tube because the picture is pretty good for a tv its age, but the problem is i could have the tv on for maybe 6 hours and all of a sudden the screen goes black and but the sound stays on. I turn it off and on again maybe 3 or 4 times and the picture comes back again same as before and it may do the same thing again after so many hours. What would the problem be.?

  12. 14
  13. 15

    I have a Toshiba 27A40. I have had the horizontal line issue mentioned in the article. However, after about 2 weeks, the issue went away and the picture is back (with no action taken). Can you suggest what might be causing this “temporary” issue? I am trying to decide whether to replace the TV or not. My preference would be to keep it, but only if it has a reasonable long life yet. Thank you.

  14. 16

    My 21 inch crt samsung tv of a model of 2005 with woofers and twin tweezers were running fine until few months when it started flickering at the rate of 1 flicker per 10 sec.As the tv ran continuously the rate dropped.The pic quality was same as a new one.But today when I started it showed red screen and then when I restarted it was not displaying anything,the display felt dead but the audio was fine.What can be done?I want this crt tv to run again gorgeously as it is a gem of tv.

  15. 17

    My tv is 14″ toshin. Screen looks blue, when i switch on the tv, screen looks blear image for some seconds but after some seconds it becomes full blue screen, but sound system, channel changing, volume up-down are ok.What is the problem?

  16. 18

    this is probably some of the worst advice on half of the CRT issues. older CRT television sets rarely ever suffer from yoke coil burn out, vertical line is pretty rare too, horizontal line is almost always a failed capacitor that may have taken out a resistor or burned up the IC controlling the vertical sweep, this is semi common. magnetism is either due to close magnets mentioned above or a built in degauss coil failure, a bad solder joint is first suspect, further diagnosis is needed past that, resistor, capacitor or some other failure.
    the picture with all the red all over it would be an internal issue with the video feed from the tuning or input circuit to the primary input for the crt inside the tv, poor connections result in snow in the background or hum bars from interference. modern CRT’s were built with poorly constructed flybacks and CRT’s, flyback issue results in arcing sound by the flyback, CRT’s that didn’t have a good vacuum pulled on them in construction fail by going dark and streaking colors sometimes. arcing in the neck of the tube is rare unless a component fails that brings the voltage to the crt neck up. sometimes the tv will loose one color entirely, this is a shorted electron gun or its pathway on the board. another common fault is the TV just wont come on anymore, this is a failure in the power supply, old power supplies used diodes to flip the alternating current into pulses of direct current which was smoothed out by a large capacitor (probably the largest one in the set) some had IC’s to assist, modern units may have had switching power units. in both cases the capacitor probably failed and took out the diodes and possibly the IC if present. another thing that can cause a tv to not power on or power itself off is a bad solder joint or protection circuitry killing it due to excessive HV.

    this is of course after all usual methods have been tried, bad cord, improper user adjustments, lose connections etc.

    early 2000’s Chinese manufacturers made very poor capacitors that failed rapidly, within months or a year or so, some of these survived into the late 2000’s they are all just about gone now.

    Older sets from 80s back can have issues with multiple capacitors just due to age, environment kept in, and internal design flaws causing heat near capacitors without high temp capacitors used. these sometimes require a complete capacitor replacement (larger ones especially)

    anything in the 60s or before should never be plugged in, inspected for wax paper caps, and “bumblebees” wax caps in a hard round shell, ones not round but tear drop shaped on the side running lengthwise are usually ok, in these sets you should also replace all the other capacitors, you can sometimes get away with keeping the large filter in perfect scenarios, however this is a gamble, these sets will almost surely be complete tube sets, meaning the chassis is full of small tubes, this kind of restoration should be left to a professional.

    • 19

      I have a Sanyo TV which served me well until I moved to a different location. Whenever I connect the decoder, I have to touch and press the connectors at the back of the tv before the picture shows up. The picture sometimes gets dim and disappears then I have to press down on the connectors again. Any help would be appreciated

    • 20

      I have a Toshiba 27A40. I have had the horizontal line issue mentioned in the article. However, after about 2 weeks, the issue went away and the picture is back (with no action taken). Can you suggest what might be causing this “temporary” issue? I am trying to decide whether to replace the TV or not. My preference would be to keep it, but only if it has a reasonable long life yet. Thank you.

  17. 21

    Hi, I have a 21″ AIWA make CRT TV bought in 1999. It has served me well so far. Since 6 months, I find about 12 white horizontal lines on top portion of the screen.How can I get rid of these lines?

  18. 23

    Hello, Mr. Right, I have a Toshiba combination tv/dvd player. It was made in 2005 and it served me beautifully until 2012, when the electricity was disconnected at that location. After moving some six months later, it did not power on again. I have kept it because I may be able to get more use out of it. Also, I have three other tvs that may have useful parts that the Toshiba can use. Thanks in advance.

  19. 24
    • 25

      power supply is not filtering out AC correctly, it needs repaired, large cap most common failure in my opinion, but I’m guessing here since I don’t see the actual video of it myself

  20. 26

    I have 21″ LG FLATRON TV in which screen size showing only in middle means screen size decreased.

    what is the solution ?

    Ratan 9042304088

  21. 27

    I have a 29” Panasonic flat screen crt tv, high sound occurs when I turn it on . There is no picture seen on screen. What is the problem ?

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